Audrey Hepburn was a trendsetter in more ways than one. We all remember her for her ballet flats, ankle-cropped pants, slim black turtlenecks, pixie haircuts...the list goes on. But did you know she shared in one of the most celebrity-worthy trends of all? Decades before it was something to fill the pages of a tabloid or be plastered all over social media? Before Jennifer Aniston married Justin Theroux, Mila Kunis and Ashton Kutcher eloped, and Mary-Kate Olsen finally tied the knot with Olivier Sarkozy, the one-and-only Audrey had a top-secret wedding of her own.

Audrey Hepburn was a trendsetter in more ways than one. Of course, we all remember the actress for her style—ballet flats, ankle-cropped pants, slim black turtlenecks, pixie haircuts...the list goes on. But did you know that she shared in one of the most celebrity-worthy trends of all? Decades before it was something to fill the pages of a tabloid or be plastered all over social media? Before Jennifer Anistonmarried Justin Theroux, Mila Kunis and Ashton Kutcher eloped, and Mary-Kate Olsen finally tied the knot with Olivier Sarkozy, the one-and-only Audrey Hepburn had a top-secret wedding of her own.

Ten letters belonging to the actress and style icon have recently been released as part of an upcoming auction for Bonhams, as part of their entertainment memorabilia sale on June 29. All were penned to Hepburn's friend Sir Felix Aylmer, and all contain little-known secrets about Hepburn’s life between 1951 and 1960. The set is expected to sell for nearly £4,000.

One of the biggest reveals? Hepburn's wedding to her Roman Holiday costar, Mel Ferrer, was celebrated in Switzerland in 1954, but few were privy to the actual vows that were exchanged prior to the event. In a letter to Aylmer, Hepburn revealed the couple's plans: “How dearly we would love you to be with us on our wedding day," she wrote. "We will have the car take you up to our mountain peak, Friday, for a gathering in our chalet of our nearest and dearest! Saturday will be the wedding. We want to keep it a dark secret in order to have it without the press."

While the marriage to Ferrer may not have lasted, the Hollywood trend of top-secret weddings had just begun. Who knew Holly Golightly was such a rebel?